Device for regulating the temperature of superheated steam.



. K. GUTHARDT. DEVICE FOR REGULATING THE TEMPERATURE OF SUPERHEATEDSTEAM.

' APPLICATION FILED APR.9. 1913.

1 11 6. Patented June 8; 1915 DEVICE FOR REGULATING THE TEMPERATURE OFSUPE :1

menace.

Specification of Letters Patent.

Patented June a, 1915.

Application filed April 9, 1913. Serial No. 760,034. I

' tain new and uesful Improvements in Devices for Regulating theTemperature of superheated wSteam, of which the following is aspecification.

This invention relates to steam boilers provided with superheaters andthe subject matter is a device for regulating the temperature of thesuperheated steam.

Until lately, the temperature of the superheated steam was generhllyinfluenced by throttlingdampers ordisksbuilt into theheating flues oftheboiler. This course has however been abandoned of late, because suchdampers are rapidly destroyed by the heating gases making disturbing andcostly reconsequence the method now followed is to overheat the steam toa higher temperature than the one at which it is used. and to cool itdown to the desired temperature'by for instance the introduction ofwater into the superheating pipes. As the heat utilized for superheatingthe steam is partly e'mploved in a futile manner on accountof thesubse-' quent recooling. all such recooling-devices work with great lossof heat.

' The obiect of the present invention is now to provide a device forregulating the temperature of the superheated steam which is devoid ofthese disadvantages. For the purpose of regulating the temperature ofthe superheated steam in accordance with the present invention. meansare provided which permit the part of the heating surface of thesuperheater. through which 40 the boiler steam first runs. to entirelyor partiallybe deprived of its pripcipal object as steam superheater. bythe injection of an auiustable quantity of water into the inner of thesuper-heating pipes and to be utilized as an additional boiler heatingsurface for the generation of steam.

In the accompanying drawing, one embodiment of the invention isillustrated in connection with a tubular boiler with header,

and Figure 1 shows diagrammatically a representation'thereof as appliedto atubular boiler with header; Fig. 2 a portion of thesuperheater inside elevation. partly in section and in larger scale: Fig. 3 an end 66view of Fig. 2 seen from the right; and Fig. '4adetailmstilllargerscale.

pairs necessary within a short time. As a continuous line the I windinThe tubular boiler with header, represented in Fig. 1, consists of acylindrical upper holler A and two water chambers B and C which areconnected to each other by means of a nest of water tubes D. In the freespace limited by the upper boiler A, the water chambers B and C and thetube nest D, the superheater is situated, and it consists of two systemsof serpentine pipes M displaced relative to each other. These serpentinepipes open on the one hand into a steam chamber L of square crosssection, and on the other hand into a similarly shaped steam'exhaustchamber N. The first 70 one of these steam chambers is connected withasteam conduit F leading from the fresh steam valve E, while the supplyconduit W for the superheated steam is connected with the chamberN.

In adcordance with the present invention, narrow pipes R, closed attheir inner ends are inserted in the upper ends of the serpentine pipesM of the superheaters, which narrow pipes pass through the outerwall ofthe chamber L, secured by tighteningplugs V. All of these inserted pipesR open into a wide distributing pipe K outside the chamber L. beingconnected thereto by pipe elbows 1 and this distributing pipe K- is 85connected with the water chamber of the upper-boiler A by' means of apipe H and may be disconnected therefrom by means of a closing member G.Helically wound plate strips S are pushed over the inserted pipes R- andthese strips rest on the one hand on the inserted pipes R and on theother hand on the inner wall of the serpentine pipes 'M. The insertedpipes R are moreover provided with a great number of small holes 1',which follow in a. of the plate strip, being arranged on bot sides ofthis strip anda'long its whole length.

The operation of the described device is as follows: During the normaloperation of the boiler the valve G is closed and thesuperheatergenerates steam of certam temperature corresponding to its normaloperation. Should now for instance, on account, of 105 forced running.the temperature of the superheated steam reach above-the desired heat,it will then be necessary only to open the valve G. Some of the boilerwater wlll then enter through the conduit H into the 11 distributingpipe K, which water subscquently'will proceed from there to the indi-,vidu'al inserted plpes B, through the pipe elbows P. Though the holes1' water will thereupon be injected and subsequently evaporate againstthe wall of the serpentine superheater pipe M, which is being heatedfrom .the outside. The water that does not reach the walls will bethrown outwardly by the whirling steam following the helical platestrip, and will therefore also be evaporated. Since therefore much wetsteam is produced in the part of the superheater into which water isinjected, the lesser or greater A opening of the valve G willconsequently cause that part of the heating surface of the superheaterwhich is next to the boiler to be partially or entirely diverted fromits proper function, namely that of superheating the steam generated inthe boiler, and the steam, runr ing through the superheater which now isconsiderably shortened in its operative- 1 length, will leave thesuperheater atla lower temperature, than when the valve G is closed. Thedesired degree of superheat may therefore be adjusted within limitsthrough the greater or smaller width of opening of the valve G. Theselimits may be made so wide .that the superheater could also be utilizedfor increasing the output of the boiler when it is being started, orwhen only saturated steam is being used. 'In order to attain this thevalve E has to beclosed altogether, and the water val-ve'G entirelyopen. As much water as'can'pass through the holes 1 will then beadmitted in the serpentine pipes M,

to be evaporated there and taken outing device, neither the entirearrangement of the boiler plant nor its accessibility suffer anyinconvenient alteration.

they may if necessary be rerolled. Further more the boiler waterinjected'th'rough the pipes R is transferred into useful steam withinthe superheating pipes, and no loss in water entering said sprinklers.

The super heater plpes M are in particular very accessible for takingout the inserted pipes R, and

energy or heat will be experienced by the de-' scribed device forregulating-the temperature of the superheated steam, which for instancewould unavoidably be the case by recooling the steam through injectionin the superheating pipes.

I claim:

of water 1. A device for regulating thetempera ture of superheated steamhaving a serpentine shaped conduit for the superheated steam comprisinga steam entering chamber,

-a steam exhaust chamber and a plurality of horizontally disposed pipesjoined byshort bends connecting said two chambers; a

sprinkler inserted in each of the horizontally disposed pipes which aresituated nearest.

said entering chamber, a helical partition surrounding each of saidsprinklers causing the'passing steam to receive a whirling motion, eachof said'sprinklers being connected with the water chamber in the mainboiler,- Y

and means for'regulating the quantity of 2. A device for regulating thetemperature of superheated steam having a serpentine shaped conduit forthe superheatedsteam comprising a steam entering chamber, a

steam exhaust chamber and a plurality of horizontally disposed pipesjoined by short bends connecting said two chambers a sprmkler insertedin each of the horizontally disposed pipes which'are situated nearestsaid entering chamber, a helical partition. surrounding each of saidsprinklers causing the passing steam to receive a whirling motion, eachof said-sprinklers being'connected with the water chamber in the mainboiler, and

hand operatedv means for regulating the quantity of water entering saidsprinklers; said sprinklers being closed at their inner arranged intworows on e1ther side of said helical partition and Parallel thereto;'

whereby an adjustable quantity of water ends and provided with aplurality of holes may be inserted into the first part of the Yhorizontally disposed pipes which are situated nearest saidentering'chamber, thereby partly or wholly suppressing the superheatingof the steam, said water being converted into useful steam.

- In testimony whereof I have afiixed my signature in presence of twowitnesses.

' I KARL GUTHARDT.

Witnesses: I I Jumps Rori'm, i Max ROLEDA.

